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Pagand, Pascal. |
When facing the increasing development of aquaculture, farming in recycled water is an alternative to limit the impact on the environment: farming produces a lower amount of wastes but of higher concentration which can be treated. The goal of this thesis is to evaluate the efficiency of high rate algal lagooning/ponding (HRAP) for the treatment of marine fish culture effluents. Also, this study utilizes wastes from Dicentrarchus labrax grown in Ifremer's recycled waters station. The first step shows the particularities linked to recycled water farming effluents. They are characterized by low particle and organic substance concentrations as well as strong dissolved inorganic nitrogen (DIN) and phosphorus (DIP) concentrations. Furthermore, nitrogen is mainly... |
Tipo: Text |
Palavras-chave: Fish; High rate algal pond; Aquaculture; Alga; Water treatment; Recirculating effluents. |
Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/1999/these-1748.pdf |
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Pagand, Pascal; Blancheton, Jean-paul; Casellas, Claude. |
Fish excretions and the transformation of nitrogen by bacteria in the nitrifying biofilter are two of the main sources of dissolved inorganic nitrogen (DIN) in fish farms that use recirculating water systems. In this study, the DIN concentration in an experimental Dicentrarchus labrax aquaculture system was calculated using empirical sub-models for fish growth, ingested food and water replacement. The specific growth rate (SGR) (% day(-1)) and the daily feeding rate (DFR) (% day(-1)) both depend on the average weight, W (g), of the fish: Y = aW(b), where Y may be SGR or DFR, and a and b are empirical constants. The DIN discharge rate, Gamma(N) (% of ingested nitrogen), in the experimental aquaculture system was expressed as a function of increasing... |
Tipo: Text |
Palavras-chave: Recirculating water system; Nitrogen production; Model; Fish farm effluent; European sea bass; Dissolved inorganic nitrogen. |
Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-514.pdf |
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